Bacteria and viruses are pathogenic microorganisms, and there may be some that can cause infections in the body. When there is an infection causing clinical symptoms, one of the more important aspects of treatment is to treat the cause. Bacterial infections are mostly treated with antibiotics, but sensitive antibiotics should be applied, not abused, and should be applied in accordance with the corresponding drug usage, not in insufficient dosage, otherwise it is easy to cause bacterial drug resistance. Viral infections are also mainly treated with antiviral drugs, and it is also necessary to know the specific type of virus to be able to choose the targeted antiviral drugs, otherwise it is not possible to apply them casually. You should know which specific bacteria are sensitive to which antibiotics before applying them. If the condition is serious, you can empirically apply antibiotics first, but you must do a bacterial culture plus drug sensitivity test, which can guide the future replacement of antibiotics. As for antiviral drugs, the type of virus needs to be known in advance before applying antiviral drugs.